java - 停止/取消 SwingWorker 线程？

Question

我试图找出当我按下按钮时如何阻止 SwingWorker 线程运行。我一直在环顾四周，但在弄清楚如何做到这一点时遇到了一些麻烦。目前这就是我所拥有的:

new MySwingWorkerClass(args).execute();

然后我创建了一个按钮，我想用它来停止线程:

button = new JButton("Stop");
button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) 
        {
        // Stop the swing worker thread
        }
});

我已经四处寻找答案，到目前为止我已经设法找到取消方法。我不明白如何用它来阻止我的 Swing worker 。我尝试了以下方法，但没有成功:

SwingWorker.cancel(true);

Answer 1

您需要为您的 SwingWorker 保留一个引用，然后使用该引用来取消工作线程。

MySwingWorker myWorker = new MySwingWorkerClass(args).execute();

button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) 
    {
        // Stop the swing worker thread
        myWorker.cancel(true);
    }
});

这是一个完整的例子:

public class WorkerDemo extends JFrame {
    private boolean isStarted = false;
    private JLabel counterLabel = new JLabel("Not started");
    private Worker worker = new Worker();
    private JButton startButton = new JButton(new AbstractAction("Start") {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            if(!isStarted) { 
                worker.execute();
                isStarted = false;
            }
        }

    });
    private JButton stopButton = new JButton(new AbstractAction("Stop") {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            worker.cancel(true);
        }

    });

    public WorkerDemo() {

        add(startButton, BorderLayout.WEST);
        add(counterLabel, BorderLayout.CENTER);
        add(stopButton, BorderLayout.EAST);
        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    class Worker extends SwingWorker<Void, Integer> {

        int counter = 0;

        @Override
        protected Void doInBackground() throws Exception {
            while(true) {
                counter++;
                publish(counter);
                Thread.sleep(60);
            }
        }

        @Override
        protected void process(List<Integer> chunk) {

            // get last result
            Integer counterChunk = chunk.get(chunk.size()-1);

            counterLabel.setText(counterChunk.toString());
        }

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new WorkerDemo();
            }

        });
    }

}